Peck 1969 Earth Pressure Envelopes
After observation of several braced cuts Peck (1969) suggested using apparent pressure envelopes with the following guidelines:
γ is taken as the effective unit weight while water pressures are added separately (private communication with Dr. Peck).
Figure: Apparent Earth Pressures as Outlined by Peck, 1969
For mixed soil profiles (with multiple soil layers) DeepEX computes the soil pressure as if each layer acted only by itself. After private communication with Dr. Peck, the unit weight g represents either the total weight (for soil above the water table) or the effective weight below the water table. For soils with both frictional and undrained behavior, DeepEX averages the "Sand" and "Soft clay" or "Stiff Clay" solutions. Note that the Ka used in DeepEX is only for flat ground solutions. The same effect for different Ka (such as for sloped surfaces), can be replicated by creating a custom trapezoidal redistribution of active soil pressures.
Training Video: Lateral Earth Coefficients and Soil Pressure Methods in DeepEX
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